Gultom, R. O., E. Wau, J. A. Laia, I. L. Silaban, and Y. Yennimar. “Implementation of Clustering Methods to Know Electricity Energy Sold Average Customer Type”. Jurnal Mantik, vol. 5, no. 2, Aug. 2021, pp. 1119-26, doi:10.35335/jurnalmantik.Vol5.2021.1475.pp1119-1126.